1. Rickettsial Zoonoses Branch, Division of Vector-Borne Diseases, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia.
2. Epidemic Intelligence Service, CDC, Atlanta, Georgia.
3. Present address: Division of Global HIV/AIDS, Center for Global Health; CDC, Atlanta, Georgia.
4. Washington State Department of Health, Shoreline, Washington.
5. Career Epidemiology Field Officer Program, Office of Public Health and Preparedness, CDC, Atlanta, Georgia.
6. Public Health and Safety Division, Montana Department of Public Health and Human Services, Helena, Montana.
7. Public Health Laboratory, Montana Department of Public Health and Human Services, Helena, Montana.
8. Montana Department of Livestock, Helena, Montana.
9. United States Department of Agriculture, National Veterinary Services Laboratories, Ames, Iowa.
10. Washington State Department of Agriculture, Olympia, Washington.
11. Parastitic Diseases Branch, Division of Parasitic Diseases and Malaria, CDC, Atlanta, Georgia.